package com.example.blog.service;

import com.example.blog.mapper.BlogMapper;
import com.example.blog.mapper.UserInfoMapper;
import com.example.blog.model.BlogInfo;
import com.example.blog.model.UserInfo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Slf4j
@Service
public class UserService {

    @Autowired
    private UserInfoMapper userInfoMapper;

    @Autowired
    private BlogMapper blogMapper;

    public UserInfo selectByName(String userName) {
        return userInfoMapper.selectByName(userName);
    }

    public UserInfo selectById(Integer userId) {
        return userInfoMapper.selectById(userId);
    }

    public UserInfo getAuthorInfo(Integer blogId) {
        //1.根据博客ID获取作者ID
        //2.根据作者ID,获取作者信息
        BlogInfo blogInfo = blogMapper.selectById(blogId);
        if (blogInfo == null && blogInfo.getUserId() <= 0){
            log.info("图书不存在或图书作者信息不合法,blogId:{}",blogId);
            return null;
        }
        return userInfoMapper.selectById(blogInfo.getUserId());
    }
}
